I guess it'll be another girl called Leonie Julienne/Juliana, as they don't mind using names twice in the same family (like Magali(= also Aimee's sister) Margriet (= also Floris Mum) Eleonoor (=also Aimee's Mum).
As a third name i vote for the name of Aimee's gran, who is unknown to the press (at least i couldn't find anything about Aimee's wider family).